Floating point exception due to division by zero in VPRetinaFullClusterDecoder

When trying to run Boole with VP, floating point exception was triggered here due to bit_vec_pix.count()=0. https://gitlab.cern.ch/lhcb/LHCb/-/blob/master/VP/VPDAQ/src/VPRetinaFullClusterDecoder.cpp#L393

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